fix copy-paste error ParticleSystem => Particle

docs/api/deprecated/DeprecatedList.html

@@ -458,7 +458,7 @@
 
 
 		<h3>[page:Particle]</h3>
-		<div>ParticleSystem has been renamed to [page:Sprite].</div>
+		<div>Particle has been renamed to [page:Sprite].</div>
 
 		<h3>[page:ParticleSystem]</h3>
 		<div>ParticleSystem has been renamed to [page:Points].</div>